/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.coders;



import com.bff.gaia.unified.sdk.values.TypeDescriptor;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;



/**

 * A {@link Coder} that encodes {@code Integer Integers} as the ASCII bytes of their textual,

 * decimal, representation.

 */

public class TextualIntegerCoder extends AtomicCoder<Integer> {



  public static TextualIntegerCoder of() {

    return new TextualIntegerCoder();

  }



  /////////////////////////////////////////////////////////////////////////////



  private static final TypeDescriptor<Integer> TYPE_DESCRIPTOR = new TypeDescriptor<Integer>() {};



  protected TextualIntegerCoder() {}



  @Override

  public void encode(Integer value, OutputStream outStream) throws IOException, CoderException {

    encode(value, outStream, Context.NESTED);

  }



  @Override

  public void encode(Integer value, OutputStream outStream, Context context)

      throws IOException, CoderException {

    if (value == null) {

      throw new CoderException("cannot encode a null Integer");

    }

    String textualValue = value.toString();

    StringUtf8Coder.of().encode(textualValue, outStream, context);

  }



  @Override

  public Integer decode(InputStream inStream) throws IOException, CoderException {

    return decode(inStream, Context.NESTED);

  }



  @Override

  public Integer decode(InputStream inStream, Context context) throws IOException, CoderException {

    String textualValue = StringUtf8Coder.of().decode(inStream, context);

    try {

      return Integer.valueOf(textualValue);

    } catch (NumberFormatException exn) {

      throw new CoderException("error when decoding a textual integer", exn);

    }

  }



  @Override

  public void verifyDeterministic() {

    StringUtf8Coder.of().verifyDeterministic();

  }



  @Override

  public TypeDescriptor<Integer> getEncodedTypeDescriptor() {

    return TYPE_DESCRIPTOR;

  }



  @Override

  protected long getEncodedElementByteSize(Integer value) throws Exception {

    if (value == null) {

      throw new CoderException("cannot encode a null Integer");

    }

    String textualValue = value.toString();

    return StringUtf8Coder.of().getEncodedElementByteSize(textualValue);

  }

}